[v4 05/23] drm: Add Color ops capability property

[Uma Shankar <uma.shankar@intel.com>]

Add capability property which a colorop can expose it's
hardware's abilities. It's a blob property that can be
filled with respective data structures depending on the
colorop. The user space is expected to read this property
and program the colorop accordingly.

v2: Added documentation for hw_caps blob (Dmitry)

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
---
 drivers/gpu/drm/drm_atomic_uapi.c |  3 +++
 include/drm/drm_colorop.h         | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 3dd932647702..14d7939780db 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -771,6 +771,9 @@ drm_atomic_colorop_get_property(struct drm_colorop *colorop,
 		*val = colorop->lut3d_interpolation;
 	} else if (property == colorop->data_property) {
 		*val = (state->data) ? state->data->base.id : 0;
+	} else if (property == colorop->hw_caps_property) {
+		*val = state->hw_caps ?
+			state->hw_caps->base.id : 0;
 	} else {
 		return -EINVAL;
 	}
diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
index 1cd8ce81224e..731bd1484c34 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -141,6 +141,16 @@ struct drm_colorop_state {
 	 */
 	uint64_t multiplier;
 
+	/**
+	 * @hw_caps:
+	 *
+	 * This blob will be of type struct drm_color_lut_range which contains the
+	 * hardware capabilities of 1D LUT. These include number of LUT segments,
+	 * number of LUT samples per segment, start and end point of respective
+	 * segments and the precision of the LUT sample along with the normalization factor
+	 */
+	struct drm_property_blob *hw_caps;
+
 	/**
 	 * @data:
 	 *
@@ -309,6 +319,13 @@ struct drm_colorop {
 	 */
 	struct drm_property *curve_1d_type_property;
 
+	/**
+	 * @hw_caps_property:
+	 *
+	 * Property to expose hardware lut capabilities.
+	 */
+	struct drm_property *hw_caps_property;
+
 	/**
 	 * @multiplier_property:
 	 *
-- 
2.42.0